EAThread/include/eathread/apple/eathread_sync_apple.h

///////////////////////////////////////////////////////////////////////////////
// Copyright (c) Electronic Arts Inc. All rights reserved.
///////////////////////////////////////////////////////////////////////////////

#if defined(EA_PRAGMA_ONCE_SUPPORTED)
	#pragma once // Some compilers (e.g. VC++) benefit significantly from using this. We've measured 3-4% build speed improvements in apps as a result.
#endif

/////////////////////////////////////////////////////////////////////////////
// Functionality related to memory and code generation synchronization.
/////////////////////////////////////////////////////////////////////////////


#ifndef EATHREAD_APPLE_EATHREAD_SYNC_APPLE_H
#define EATHREAD_APPLE_EATHREAD_SYNC_APPLE_H


#include <EABase/eabase.h>
#include <libkern/OSAtomic.h>


#define EA_THREAD_SYNC_IMPLEMENTED


// EAProcessorPause
// Intel has defined a 'pause' instruction for x86 processors starting with the P4, though this simply
// maps to the otherwise undocumented 'rep nop' instruction. This pause instruction is important for
// high performance spinning, as otherwise a high performance penalty incurs.

#if defined(EA_PROCESSOR_X86) || defined(EA_PROCESSOR_X86_64)
	#define EAProcessorPause() __asm__ __volatile__ ("rep ; nop")
#else
	#define EAProcessorPause()
#endif



// EAReadBarrier / EAWriteBarrier / EAReadWriteBarrier

#define EAReadBarrier      OSMemoryBarrier
#define EAWriteBarrier     OSMemoryBarrier
#define EAReadWriteBarrier OSMemoryBarrier



// EACompilerMemoryBarrier

#define EACompilerMemoryBarrier() __asm__ __volatile__ ("":::"memory")




#endif // EATHREAD_APPLE_EATHREAD_SYNC_APPLE_H